Pen



FIG. 1 is a front perspective view of a pen showing our new design;

FIG. 2 is a detailed view of the pen shown in FIG. 1;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a detailed view of the pen shown in FIG. 3;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a side elevation view thereof;

FIG. 7 is a detailed view of the pen shown in FIG. 6;

FIG. 8 is a top plan view thereof;

FIG. 9 is a detailed view of the pen shown in FIG. 8;

FIG. 10 is a bottom plan view thereof; and,

FIG. 11 is a detailed view of the pen shown in FIG. 10. 

CLAIM The ornamental design for a pen, as shown and described. 